Script to retrieve info about a dnsmasq instance

dnsmasq-info.sh

#!/bin/sh
# usage:
#       - $0               # queries the default server
#       - $0 NAMESERVER_IP # queries the provided server
# ------------------------------------------------------------------------------
# Example output:
# dnsmasq   : 127.0.1.1
# servers   : 8.8.8.8#53 216 1 # template: "IP#port valid_responses invalid_responses"
# cachesize : 10000
# insertions: 9876
# hits      : 5678
# misses    : 1234
# ------------------------------------------------------------------------------
#
COL_SZ=10
DIG="$(which dig 2>/dev/null)"

[ $? != 0 ] && echo "Command 'dig' not found" && exit 1

if [ -z "$1" ]; then
    DNS_SERVER="$("$DIG" txt chaos hits.bind | grep -o ";; SERVER: [0-9\.]*" | cut -d" " -f3 )"
else
    DNS_SERVER="$1"
fi

printf "%-${COL_SZ}s: %s\n" "dnsmasq" "$DNS_SERVER"

for name in servers cachesize insertions hits misses;do
    printf "%-${COL_SZ}s: " "$name"
    "$DIG" @$DNS_SERVER +short chaos txt $name.bind | tr -d '"'
done